Võrdle meetodeid

	Autoencoder	Faktoranalüüs	Pricipaalanalüüs
Valdkond	Süvaõpe	Uurimisstatistika	Masinõpe
Perekond	Machine learning	Process / pipeline	Machine learning
Tekkeaasta	2006	1931	2002
Looja	Hinton, G.E. & Salakhutdinov, R.R.	Louis Leon Thurstone	Jolliffe, I.T. (textbook); Pearson & Hotelling (origins)
Tüüp	Neural network (encoder-decoder)	Method	Unsupervised dimensionality reduction
Algallikas	Hinton, G.E. & Salakhutdinov, R.R. (2006). Reducing the Dimensionality of Data with Neural Networks. Science, 313(5786), 504–507.	Thurstone, L. L. (1947). Multiple Factor Analysis. University of Chicago Press.	Jolliffe, I.T. (2002). Principal Component Analysis (2nd ed.). Springer.
Rööpnimetused	Otokodlayıcı (Autoencoder), otokodlayıcı, auto-encoder, encoder-decoder network	EFA, CFA, latent variable modeling	Temel Bileşenler Analizi (PCA), PCA, principal components analysis, Karhunen-Loève transform
Seotud	4	3	3
Kokkuvõte	An autoencoder is an encoder-decoder neural network, popularised by Hinton and Salakhutdinov in 2006, that compresses data into a low-dimensional latent code and then reconstructs it, enabling dimensionality reduction and anomaly detection. By learning to rebuild its own input through a narrow bottleneck, it discovers a compact representation of the data.	Factor analysis is a statistical technique for identifying latent (unobserved) dimensions underlying observed variables, developed by Louis Leon Thurstone in the 1930s and formalized by Jöreskog (1969). Exploratory factor analysis (EFA) discovers unknown factor structure from data; confirmatory factor analysis (CFA) tests hypothesized relationships between observed and latent variables. Essential in psychometrics (test development), organizational research (measuring constructs like leadership style), and biomedicine (identifying disease subtypes), factor analysis reduces dimensionality while revealing conceptual organization in multivariate data.	Principal Component Analysis (PCA) is an unsupervised dimensionality-reduction method — given its modern textbook treatment by Ian Jolliffe (2002) — that compresses high-dimensional data into fewer dimensions while preserving the maximum possible variance. It re-expresses correlated variables as a small set of uncorrelated principal components ordered by how much of the data's variation each one captures.